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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a5aafc09e6b7b7091c6510be732ffd6545c49c4445c12dae5e138783fc0632' 
  AND token = 'FcmV7Hp85ugLiMgoz0mlcI0nW2WU+KOxON6cLVNMgqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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