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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0738d3e38fedeaeb8f2204169db4d391b58a14062476d7d6e71daa955f27af91' 
  AND token = 'JLnx6MEhH850TrBQXOHFzBRH1V/n/bfmLDbn3bN44wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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