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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe88e738f53225f80303b97175a7dfaef670a2f13b32b6bdaf9c07a05f1e10c' 
  AND token = 'UPQQHczzMKgUHydKmPxQ2rbN/jPiqjKswo7rAeWKJvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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