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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eedb1bc8667bb07a0c444b8651238d8c9a5559cc2c2f1241d8ae0e2663984ce' 
  AND token = 'W+vqwEPlEkhdaljUXcfc7kxYGqgAJ7WFruixs9L2qts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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