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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c03c5ed695eac502eeae8557d4457e3c3d99f282ecc45b16a1df2e25df20e5' 
  AND token = 'Uh0REVGbhqj5Q3rX5dP9HVduqieLWiFBzESGvSL9JBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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