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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd396445a34ea762d493c263231e3fe91b3407313ddc6571cb99cf7fe96cd4c76' 
  AND token = 'xB2/7JNJjtn6e7RtF+FRZ4USFe5cptbmv/kT8tVvw6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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