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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51be9b5be5f57d8aae35377264f186b134234be558bce6264721cd8eece50b3' 
  AND token = 'hxF9Z5l2wl7RbChosZJ1irhO2oRwga+qOTdI/mZQsic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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