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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9dcf6ac556e2753051294d01a79bc172e84335f171283021598b279c9f67e6' 
  AND token = 's8unTRsQ1mvJAoETY2EbHmvgzoCrHoUNw2FNMRIoo0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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