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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96553a090f9d0e847f47e9a18d97877a4768d3f0b75ec11531eb252408b5db2' 
  AND token = 'CTJKI1Wsyu90OIcfnZywy/85BGbOS9OzM9IcZbiI8iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}