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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23327770eeb8c4aa3e2625a0b0b2abfeeb4b6b99d214b43f87efc6b343ebdf1c' 
  AND token = 'YIxM2srby7W3DmUCdhlv9HSLdW19LqZonJb5To8Pu4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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