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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d4e9209f6ba9a4a03a4eb0ddfa7925dfda5391f599267affedcf0508e4ff9b' 
  AND token = '8G7Qq1G5KB3l5d2H1bBCr8yQ4XpaSahAYugulTgZChY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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