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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f31ccceb0783ac7d3b4fcc15daf21e69746dd545e13d3b053f134c4c60ac8ee' 
  AND token = 'r+Oe2ictJnwiORCmxDValWpDPECOZPS5Cn4PB/Jy1Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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