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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d444dc5e802af6203ad70c7d3487fa59b8d65c1de68d87a597fbf4a488afa3a' 
  AND token = 'oaCPmxCwI3GISFU2PH3K7af1imqnAtUNa+BYvY+sevM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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