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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906c8e3b4600521cd9a5aa160c4b68fd8828b5481f76e9eb3ccabc014ee6d169' 
  AND token = 'KgBECN206apSgCsoL78StYfdfg5b18aTkOs+Jc+bpG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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