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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b1a22d431d3ce3e84a7c9038db316d2776fa49bf3aa8a77514b7bbffdaf32b' 
  AND token = 'yDdfY8kf/mfvvcU1Q+GpDrSQBf4fgEehq/i19PeBxKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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