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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c7f1d2d40ce2b0ec8f1ffa351d6f8f77806a2fc3b6937b5d0f99e170b73f65' 
  AND token = 'uwFMXu9pWM9Qp5Bq17KDW3czZNtegY8c9xvamA5I154=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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