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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3804e1fc9562d565a7cbaac433f2e6df8bd431cb35be7ba95ea8d1ce68cda205' 
  AND token = 'tmqboI+sfa1ir55rEO7wp+18Rv/2Xz5xxy4ePJlwO1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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