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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cefb9e50b9444e2cf91bb4ef4b0c07c4bdd7a4994aa288eb6ca7da3bf722885' 
  AND token = 'v7y+24EhtsyGv6pHIDhPvw3PhvsgLJmmM2FjxyaH8KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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