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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f63510c7af9c7fb736cc183ad88600181fe15b462e79e885622a9d975f3ec63' 
  AND token = 'VcLJvjZGHdT1dteaIT/wdmUvApO9atVPRh21XXcX830=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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