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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0ec76996a3eab6e51f76629dadf0364865a6de9e4d7fb41291ecd79516b15d' 
  AND token = '1H/2v0SERjHuu5anhfVXEESbubF60jvrS7YFfVdrPxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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