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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260a9f01948e05aa423e0b225bc7d4e4e1a26d0dcc3537a1aa8c6064b4c9c0fd' 
  AND token = '9I4t7x2Q5yYa89R4z/sY2DTOXK41x275gkyjKO1RLys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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