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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d24847a96bc13270c8c1c0414b97bb6d3201666912c3d9aba464bf7acb4082' 
  AND token = 'RAyjbSLB0Eu3jFxHO+hACwbef3gK71bMn1FwGfJQ1hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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