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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adebb4a46c60e1a37b7669b313149ce8874770ebf377e1bb5f4d8899df51229' 
  AND token = 'ATDFxxhJmc7GkqVnb+Vs9Bs7oHL5xsepM9eCKdNZAXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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