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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06abf50ad5a95734ee6ac4e19d8b6d1955fa839525a580776c9d496a68c55384' 
  AND token = '8xnT8H2+LCRNg/Cv714cd4Od5OW9+Y7awZzRRUL3eUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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