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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6727593eead5c1abf1f0e28672bce1dab716066360a4a6d5439604c902793f89' 
  AND token = 'ziCV6CyGVs9VcoNAXigqYVX7b0pyBNQkPW4Vs3btkp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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