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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a29334c2ce2c1e02246ce19b2442d1a2522db3b9a7fec2973918fe6ba0dfdac' 
  AND token = 'gFkHvNVeHOw4K+1C772TcpKbtNS8qs6RnGOvyuPeqsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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