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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc550a8b28af0c690e7bc3602214b374288449f215fbb000570015429c9f8cb' 
  AND token = 'flCz2esIfmonygQEw/wKchZN3UVjEYeaoEH+9li7DDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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