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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cd8122e7dd27f24d3704c8bbd06ebe19971998ddb6d58985815bd55d9cda8a' 
  AND token = '6xxnVIWFgJIIHTf1/CEvfd+QRhSNT7WAVWszfrrZdr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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