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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56be45b7e8a84ce0bac080a70589f79d5f9578bd4c3d2423003a2800c86d6a92' 
  AND token = 'ax8GjAM+duI0W4ubWEkGlU3PQaKTU0Zz6Fr8KCRuin4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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