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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd7baaa08a9f936446bc4c60f4be6477368831f275268dc9f1785f2cdd19e87' 
  AND token = 'Lfz6jlWLS7s7EUbiERcxUmC5sE/VgMax5F5orgxl2mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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