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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9a2f0d3a6f2c65d043e2de70a3a3ac117605b699f74470a962ef0f63524594' 
  AND token = 'WAGESfGcjIZPOBoV2ZM5dizF9l2qZxlgE6fVNIi8cmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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