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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2898c667117744d0a51420d8115ac84ba818fd3e59f4c1f02098a353b735251' 
  AND token = 'aT3z5Y2iZYhzwfAfNnbMxK/p0Lx7xrtfHLWYpgCYi9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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