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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aeb77d2426ce5a58b8a9b2ead901636664663fa7a29935d32e936897adf67e0' 
  AND token = 'fpAqj2WR2soj5q7JiTfCtnpbyxt4bBs1hnHq/pVs/O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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