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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1e11e4a0acb3c424b05e9cea668920f73b5402797333547f7b116860882133' 
  AND token = 'EvHRt+iAxOQzeUTugjxlHCKgln6h+EjToosrUo/LaHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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