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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5186f6a7244d2e4d3d4e12d200c530511739096771acdf22f362f5271ab872d1' 
  AND token = 'BF7ibIMtds3g04x2WrZsVgbHUsqPUCzSmgz3nuVu9KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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