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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13572fae3963d7d7f99153997f9486ec23697c4f7d55324396ca537f6aa87953' 
  AND token = 'OpBWjdtiMfFUcdYD09bLJq2K4ipU8H2np3zKaWdfroY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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