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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f60d2e13d1a10a0e6d49059f9404b129a1aa1b53b742da04abdc85bd2cb6cad' 
  AND token = 'g1psMbmpePOvo5MP3fbMaTZMPlAHZIeMM9ZMUZ8VowI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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