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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf77f0d0fb420cb3343f67798b13bdfb45f43b36e8748d8ae597c70e05bd83d' 
  AND token = '/W+gtjUR0ZCyRIIgwCXacmAmNkjifB88V5MEHadaBj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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