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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e860bd27d5d62aab13b00502be3b46a778354e3a56e324526a05adc2dd61dc' 
  AND token = '4Fmbb3yTyk+pjpg/3lO7qGZk9pWmW5bii3S06lddxYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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