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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9d1f60838b2ca0c4c0626cd076329149f5c749f6e543ee4bd8aaab8288d613' 
  AND token = 'WHl13q8K91bkuIXudS+jOy8N5PyDYf7wtYk32/ixbUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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