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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1daf276c905dc5c675ef3a40cffc60d055e007f5e0573ec808a839174eb06df5' 
  AND token = '0QDGaOD1mVTo3Dt0JZNAMOec4AcNlxMZYNjj2t3kdM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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