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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c579b0b273eb7d8f72a1fe36733edbd4c4d6b0357d4568ff1bd5998de2956a4' 
  AND token = 'Wfo1mHlA/JL8LScNz+x5lETayBlqW2kE45YNKjFxqWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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