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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351fa17fc86e68458832b28e6237cdfb170d69a161c86b47ca48c1b86e6f1b2d' 
  AND token = 'FaH4lxceqdbwRDOSxYgzvwXtk8pMo5/atUloL8ODLAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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