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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a1969e22afd33d209b38cd8bcd493848aec19768babd831652f8885c778b22' 
  AND token = 'GpXPJc9F6WXZXh1vY1MDVHBvuErZ3empYe8lFuhhOPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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