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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ac12c1b1a6dab6f0eaf43601a0ddae5468293b758b2fc463f7b0b23dfedacb' 
  AND token = 'CbPqkJT+DZwQKXvcYPYaIDkX0eCRH8sX291gpUoujjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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