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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8199a6894b0cfa3bfdd76273924ce8ac6cb81a7646d3e1e137aa32be06e584' 
  AND token = 'bB66Zo5hWbth3SRN/Lmp8F3KGCh+6LIJfGo8BS0D670=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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