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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201c6fc36e3ba3fe007929dfaecee57ae42cc8c5cf12473d87b9e95fd96140fd' 
  AND token = 'yCiOTztIDmnuIdU5tjBCLSFkNbsVLmATMsBxb4gMiTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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