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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d55d86eeae0a0af2f1f79c5bfe09493d306e781a2897496119655f37eccca4a' 
  AND token = 'etBwE/Qacel9cyMj9UWSqr1Kem2hrjZEIY7pWQxM/48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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