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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc402bf2a988be5b63ed4d348ab8c35568214d0ae772f6e07a59508e231ce80a' 
  AND token = '48+rIDbBckW/Sb3+nzZJPjE5B50jMTsl+5Ong1iGOZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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