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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2679a334ffc18d96c68081e5fb612b87d353bf641c2ca697a378522abfe551' 
  AND token = 'Ld1nTVDxTdQFvZB1Xvyg48TRNi2j7atNYkx7JtyX5qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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