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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd851532d9fc4de940aec756b28469bd1f2959d9579477c3db1b196240b7d6f' 
  AND token = 'R7GlWk8+yq8hExLjFhUcF9Kl/Ay1t+UAp16ysO3G1sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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