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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60aeb1903c819e7b2935ca38601717e26c223e8a2d6c6c9dd7b5a674f01a75b2' 
  AND token = '1us27CulniPb2xL7TQ+CiztHklS8U46k49wK1fvk/EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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