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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38f5e2d1b28e32b9a3c88c67a77cefae3c91b5804acbee03d206bdbb07d1f57' 
  AND token = 'UVeAsH9+ItX0l2BghptehWv/Tlg0ebjbwSxr34ptp5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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