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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e230c44958f12d20382738b420185b8a04501d40974fb5d459148e62bc04c158' 
  AND token = 'uvrsWeBIUoMPuNQ67qyo/Dp1uwnoV6iLwX0UI8U1Gbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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