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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec4f3745cbce91cda0c58992a15a9e2b565f74952011c076b7620d4bc2d97ed' 
  AND token = '8qZJ4Gx1bEckv1GPeiNT7GEWsPloT0thY1rgYxRYgX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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