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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2efee8a9d8ee4a595fd13852b8d31a17804c82a87593e6248e1ee47643085249' 
  AND token = 'auJECEDMWujw6Hzkq10vwuj8W+M4Bf+fe2cM5H7+1FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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