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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2d475d4f3831817c0ac6cfb18c30d5131cff18f94a79db23e5f76d482d1bd1' 
  AND token = 'hFNVbzqVc4hUuVEHGQ/r6d3t5ghy72chss+YKcIFWgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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