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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b599552bde8636b6167f35b4dd3bc753a7d6fb19906e93b8c280bf5c6a33203c' 
  AND token = 'CBUiam6ym+pA75f+A99rsMfQpFTiSwWXpp4KZncGuM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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