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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95f055cd17a77756b27732e6f42960e7108c94a45318821ecce153993473738' 
  AND token = 'jJm8euD1G31+1VN6BvNkuLGd/gFTh5TdNB4zzIvelQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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