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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac96bc9652fc1634ec9050ee151d508f6b981dcf330295fdba4dd9d789169609' 
  AND token = '6TIqljscAhZf4r+ieb2E1JBGccXab7LuB3IV3oV6duc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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