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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb980bd5a712cb998b2b39a7c979dd4ac4d44712da13106b8148a6bce6a1eadc' 
  AND token = 'kCcbinoZSdQv7PsM0ePkRPEF1SLo/9ykoxyb4O4OESg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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