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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519fa5c7a5db33400ecdc195e4169364e0cdf418ebbf54253e950803e2f3a341' 
  AND token = 'Dl0qL6L5kQUUnChxDjIf109hrVhZWSwGYqdlLnPUu+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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