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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dbaf9cb77787952a9057c424bf203473a765c0d4676e9656e2351d14050582' 
  AND token = 'SkHp18ul3HoTcWsmyIRHOIk2EO5WP/GMk1i4CFw9U3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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