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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2aa595e706739dcf0aa580377766f5d25e5e8873197dc64fac2fc58f569aaeb' 
  AND token = '4L6P2rwKXgV0GffWeTvfC/XkzwcczMTd4UeWj3kNu8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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