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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b33e9f40b02a849dee823cbb26deb39f450656d16ad8884aa3eaa126680c30' 
  AND token = '1YSMieWt3SmiEVTFDKHx0XkdFBlKgMn/DKNGrAd0tHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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