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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b1f2c9d70b0caeeaee74be4f0e321a18a506e423f044c62c7140bccbf012fd' 
  AND token = 'SStX7ZUCazWgxmV6aHxuhGZVW89L2NRTV5BI/Y+kB5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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