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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7d01defd161e985a8f77d0aa566d28f9a60d02754132440097e9a85e231b9f' 
  AND token = 'eoeqD44bltKZ6oSr0Z1wyJf8tlNl4KerODhKAS2kTKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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