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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfa90065f6ad098d2451972e279f5da06bd00eba5f2d2d456ea8f0c378ac93d' 
  AND token = 'McZdIpvskdWGKZA0/4J1r1R6lQ3R1FmWddhV+vSZVyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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